Bicycle handlebar stem



FIG. 1 is a side elevational view of a bicycle handlebar stem showing my new design, the opposite side being a mirror image thereof.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a bicycle handlebar stem, as shown and described. 